This is the same Star-Lord, that when first introduced in the 70's, was suggested to be in some sort of romantic relationship *with his ship?*
And, all things considered, making Star-Lord bi is less creepy than the Oedipal shipping (pun intended) of the 70s.

And, making Star-Lord bi is far less likely to ruin the character than Marvel's handling of Pyro in the x-books. (They took a fantastic bad guy, and redefined him as a spaz good guy.)

But, it still plays in to the tumblr-style of modern comics, which is irksome. (Why the hell should readers pay for virtue signalling and fan-fic grade I-statements?)